【作者】 阿燕； 唐泽眉； 胡文瑞；

【Author】 AA Van ; TANG Zhe-mei; HU Wen-rui(National Microgravity Laboratory / CAS, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China )

【机构】 中国科学院力学研究所；

【摘要】 本文利用PIV法对硅油液桥热毛细对流的定常的速度场进行了实时测量。为了便于测量,液桥上桥端面采取了铜环中嵌透明材料的方法,从液桥的顶部进行观测。当液桥上下桥有温差时,热毛细对流出现;本实验对于不同上下桥的温差,对液桥横剖面内的速度场分别进行了测量,研究外加温差对于流场速度分布的影响;并且在液桥中取了几个典型横截面进行测量,以期对大Pr数液桥的定常速度场有比较全面的定量的量测。此外,实验结果也可做为数值模拟计算结果的验证。更多还原

【Abstract】 The velocity fields of steady thermocapillary convection have been measured in real time by using the techniques of Particle Image Velocimetry (PIV) in a liquid bridge of silicone oil. For the visualization and the measurement of velocities distributions in a horizontal cross- section, the upper rod of liquid bridge was designed with a glass window. The thermocapillary convection was observed when there was a temperature difference between upper rod and lower rod of the liquid bridge. Different temperature differences will have different velocity distributions of the flow fields, which have got in this paper. For more comprehensive studies of the steady velocity fields in a liquid bridge of larger Pr number, we chose several different horizontal cross-sections to measure velocity fields . In addition, the experimental results can be compared with ones of numerical simulation更多还原